Metaline Fm. Biostratigraphy

The GSA field trip to the Metaline Fm. may be found in the GSA papers submitted for the April, 2024 Rocky Mountain and Cordilleran Joint meeting. Biostratigraphy and paleontology were explored in four locations. Since the May, 2011 GSA joint meeting the age the lower bedded member of the Metaline Fm has been changed from Drumian (Middle Cambrian) to Epoch 2 Age 4 (Early Middle Cambrian). The bottom 35m of 130m thick fossilerous zone is dominated by Poliella. The top 8

0m of the fossiliferous zone is dominated by Zacanthoides and Ptarmiganoides.